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United States Patent | 6,140,590 |
Baumann ,   et al. | October 31, 2000 |
A stator winding insulation for improving the dielectric and thermal properties of a main insulation of a conductor bar of an electric machine. The stator winding insulation includes a mica band having at least one layer-like carrier composed of longitudinal threads and transverse threads and a mica-containing layer fixed to at least one face of the carrier with the aid of a binder. In the layer-like carrier, the volume ratio of the longitudinal threads to the transverse threads is greater than or equal to 2.5:1 and a weight ratio of the mica in the mica-containing layer to the layer-like carrier in the mica band is greater than or equal to 6:1.
Inventors: | Baumann; Thomas (Wettingen, CH); Oesterheld; Jorg (Fislisbach, CH); Schuler; Roland (Wettingen, CH) |
Assignee: | ABB Research Ltd. (Zurich, CH) |
Appl. No.: | 060200 |
Filed: | April 15, 1998 |
May 16, 1997[DE] | 197 20 555 |
Current U.S. Class: | 174/137B; 174/110R; 174/113R; 174/137A; 174/137R |
Intern'l Class: | H01B 017/00 |
Field of Search: | 174/137 B,137 A,137 R,139,110 R,113 R,119 R,119 C,120 R,120 C |
3168434 | Feb., 1965 | Heyman | 162/124. |
4085250 | Apr., 1978 | Smith | 428/324. |
4606785 | Aug., 1986 | Zeise | 156/305. |
4806806 | Feb., 1989 | Hjortsberg et al. | 310/45. |
5540969 | Jul., 1996 | Schuller | 428/248. |
Foreign Patent Documents | |||
271613 | Sep., 1968 | AT. | |
2818193C2 | Nov., 1979 | DE. |
"Isolierstoffe fur die Elektrotechnik, insbesondere fur den Elektromaschinenbau", Scheffold, pp. 328-333, No Date. "Novomikaband 200--Kunstharzisolierung fur Hochspannungsmaschinen", Haase, et al., ELEKTRIE Heft 4 (1967), pp. 137-140. "Herstellung der Wicklungen elektrischer Maschinen", Sequenz, pp. 62-63, No Date. |